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Finding the Fourth Proportional to 72,571.50, 100,131.14 and 42,339.56

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Solution

The fourth proportional to 72,571.50, 100,131.14 and 42,339.56 is: 58,418.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,571.50 : 100,131.14 = 42,339.56 : x
  2. Step 2: Convert to fraction form
    72,571.50/100,131.14 = 42,339.56/x
  3. Step 3: Cross multiply
    72,571.50x = 100,131.14 × 42,339.56
  4. Step 4: Simplify right side
    72,571.50x = 4,239,508,198.20
  5. Step 5: Solve for x
    x = 4,239,508,198.20/72,571.50
  6. Step 6: Final answer
    x = 58,418.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.